Related Experiment Video

Updated: Aug 12, 2025

Identification of Cyclin-dependent Kinase 1 Specific Phosphorylation Sites by an In Vitro Kinase Assay
12:26

Identification of Cyclin-dependent Kinase 1 Specific Phosphorylation Sites by an In Vitro Kinase Assay

Published on: May 3, 2018

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PKCβII activation requires nuclear trafficking for phosphorylation and Mdm2-mediated ubiquitination

Xiao Min1, Shujie Wang1, Xiaohan Zhang1

  • 1Department of Pharmacology, College of Pharmacy, Chonnam National University, Gwang-Ju, Republic of Korea.

Life Science Alliance
|January 30, 2023
PubMed

Insights

Protein kinase C beta II (PKCβII) activation involves a complex cascade of phosphorylation and ubiquitination events. These processes, including nuclear entry and interactions with actin and clathrin, are crucial for PKCβII

Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Protein kinase C beta II (PKCβII) is a key regulator of diverse cellular functions.
  • Understanding the precise mechanisms of PKCβII activation is crucial for deciphering its cellular roles.

Purpose of the Study:

  • To elucidate the cellular mechanisms governing the activation of PKCβII.
  • To investigate the roles of specific phosphorylation events and protein interactions in PKCβII activation.

Main Methods:

  • Utilized loss-of-function approaches.
  • Employed mutants of PKCβII with altered phosphorylation and protein interaction capabilities.
  • Investigated nuclear entry, ubiquitination, and interactions with actin and clathrin.

Main Results:

  • PDK1-mediated phosphorylation at T500 is essential for nuclear entry and Mdm2-ubiquitination.
  • Nuclear ubiquitination is required for inducible PDK1-mediated phosphorylation at T500.
  • Post-nuclear events include actin interaction, mTORC2-mediated phosphorylation at T641, clathrin interaction, and plasma membrane translocation.

Conclusions:

  • PKCβII activation is a multi-step process involving sequential phosphorylation events (PDK1, mTORC2) and Mdm2-mediated ubiquitination.
  • Nuclear translocation and subsequent interactions with actin and clathrin are integral to the activation cascade.
  • This intricate cascade regulates core cellular processes dependent on PKCβII activity.

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